Transcript ppt - Purdue College of Engineering

Group 5 – Universal
Exports
Mike Klockow
Dan Sparks
Jon Hopp
Ed Sheriff
Wireless Ordering Device
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Allow Customer to view limited menu
of items (Appetizers, Drinks)
Similar to current seating devices,
with an LCD Screen and Navigation
Buttons
Wireless Ordering Device
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Device will transmit order once
finished and flash lights once table is
ready
Base Module will attach to computer
serial port, terminal program will
receive orders.
Computer Interface
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Base connects to computer by Serial Port
Receiver/Transmitter
Simple Microprocessor
Coaster Interface
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Transmitter/Receiver
Low-Power Microprocessor
LCD Display (no Backlight)
Input Buttons
Component Rationale
ATmega162V
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16 Kbytes Flash
1.8-3.6V VCC
0.5 Kbytes EEPROM
1 Kbytes SRAM
35 pins
1 SPI + 2 USART
Component Rationale
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LCD Display
Low Cost
T6963C Display
Controller built in
8 Kbytes memory
Hantronix 128x128
Graphics Display
Component Rationale
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Transceiver
Bluetooth/802.11
Unnecessary
Low Data Rate
Low Power
Consumption
Easy Control and
Interface
Atmel AT86RF211
Packaging Design
Guest Paging Systems
 Small size and weight
 UHF 450-470 MHz at 2
watts of power
 Vibrates along with
flashing LEDs
Packaging Design
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NTN Playmaker
900 MHz
transceiver
8-line back-lit LCD
Read questions on
a TV screen
Send and receive
data through a
handheld unit
Packaging Design
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Materials List:
LCD Display
5 push button switches
16 LEDs
5 Volt Wall-Wart
6” x 4” x 2” Project Box
3” x 2” x 1” Project Box
DB-9 Connector
Packaging Design
-Dimensions in inches
Packaging Design
-Dimensions in inches
WOrD Remote Device Schematic
ATmega162V microcontroller used to:
● Interface with menu navigation buttons
● Interface with bank of LEDs
● Interface with Toshiba T6963C LCD controller
- 8-bit data bus to write to onboard 8K SRAM
- Read and Write control signals
● Interface with RF module
- Using USART1 of μC with grounded
synchronous pin to make it a UART
- One Interrupt pin used for incoming data
alert
- 3 I/O pins for initialization of module
- Details on RF Page
WOrD Remote Device Schematic
Hantronix 128x128 graphic LCD module:
● Uses Toshiba T6963C controller with 8K SRAM
to store menu information
● 5V Logic Device
- Necessary to translate between 3.3V μC
logic using Texas Instruments 3.3V/5V logic
level converter.
● 5V and -15V power supplies needed
- Details on power supply page
● 9mA supply current, 4mA driving current
needed (low power)
WOrD Remote Device Schematic
AT86RF211 smartRF transceiver:
● Low voltage “single chip” RF transceiver
- FSK modulation at data rates up to 64Kbps
- Runs at 3.3V
- Few external component selections
● Data transmitted through UART, Chip setup
done through 2 I/O pins and 1 interrupt.
- IRQ sent to microcontroller when good data
is received.
- Data transfer through UART, Automatically
starts sending data when bits received
on data pin
- Microcontroller sets registers on the
transceiver for control
WOrD Remote Device Schematic
Power supply:
● 6V battery power supply
● 3.3V, 5V and -15V levels needed
- Texas Instruments LP2992-5 produces 5V
signal for LCD
- Two Texas Instruments LP2992-3.3 produce
separate signals for 3.3V signal for μC and
RF module
- 3.3V signal is also used with Maxim MAX776
Voltage Inverter to produce -15V signal
WOrD Base Device Schematic
● ATmega162V microcontroller used as an interface
between the PC and the AT86RF211 RF
transceiver
● AT86RF211 RF transceiver implemented
identically to the transceiver in the Remote
Device
● Maxim MAX3222 transceiver used to translate
between PC serial port signal (RS-232) and μC
(CMOS)
● All devices operate at 3.3V. A 5V “wall-wart” to a
3.3V regulator is used as power supply